'Curse' in the Bible

Then Abishai the son of Zeruiah said to the king, "Why should this dead dog curse my lord the king? Please let me go over and take off his head."

The king said, "What have I to do with you, you sons of Zeruiah? Because he curses, and because Yahweh has said to him, 'Curse David;' who then shall say, 'Why have you done so?'"

David said to Abishai, and to all his servants, "Behold, my son, who came forth from my bowels, seeks my life. How much more this Benjamite, now? Leave him alone, and let him curse; for Yahweh has invited him.